Shock absorbing spring for motor trucks



Sept. 29, 1931. A. w. SANSBURN SHOCK ABSORBING SPRING FOR MOTOR TRUCKS 2 Sheets-Sheet 1 Filed April 8, 1929 Sept. 29, 1931. A. w. SANSBURN SHOCK ABSORBING SPRING FOR MOTOR TRUCKS Filed April 8 1929 2 Sheets-Sheet 2 ill!!! 'IVIYM'III] l 7 w nmmmmmq gill/ 7 31406111 07, Q- W Jarzwurn alto-Jump Patented Eept. 22 i g I I UNA'EE Ares I aerate P ATEME atnxnnnnnw. SANSBUBN', OF PILABES DE NAGOZABI, SONORA, MEXECQ SHOCK ABSOR'BING SPRING FOB MOTOR TRUCKS.

Application filed April 8,

The present invention isldirected to im provements in shock absorbingsprings for motor trucks.

The'primary object of the invention is to '8 provide a device of this kind so constructed that it can be conveniently placed between the body frameof the vehicle and the rear axlein order that shocks incident to travelling over road obstructions will be efiectively absorbed. 1e Another object of the invention is to provide a device of this character which is constructed in such manner that the load will be fiieldably sustained whether comparatively.

ght or extremely heavy.

It Another. object of the invention'is to provide a device of this character which isextremely simple in'construction, durable,- 'eflicient ino ration, andone which can be'manufacture atavery small'cost. r

With these and f ther objects in, view,this invention resides in the novel features of construction, -formation,ocombination and arrangement of parts to be hereinafterf more fully described, claimed and illustrated the p accompanying drawingsyin which:

the cries. Q V

2 is a top plan view thereof. Figure 3 is a vertical sectional view so through a modified form of the invention.

re 1-is a vertical sectional view through Figure 4 is a sectional view on the line of Figure 3.

. The device consists of a plurality of con- 'centrically arrangedcups 1, 2,3 and 4, which 85 are preferably tapered in order that there will be no binding action upon the coil springs used in connection therewith during expansion and compression of the same.

Each cup is provided with ano ning 5 in its bottom to form annular horizontally disposed flanges 6, said cups having their re-- s ective upper ends providedwith horizontal anges 7 the purpose of which will be later explain x Associated with the cup 4 is a plun r 8 which has a flange 9 u on its upper en and upon which is mounte a head 10 to receive the initial load'or shock from the vehicle body.- This head may formed fromany m suitable material.

1929. Serial No. 358,518.

Mounted in the cup 41s a coil spring 11 which confines the plunger and'has its lower helix engaged upon the flange of said cup and between the cups 1 and 2-is a coil sprmg14 which has its lower helix resting as upon the flange 6 of the cup 1 and its upper hehx bearmg againstthe flange 7 of the cup 2. It will ,be observed that the springs 11,

.12, 13 and 14 increasein strength, the sp il lbemgthe strongest. The spring 14 is 0% 1o such strength that even when the device is su h3ected to the heaviest load said spring will not beentirely compressed and, in this manner, will maintain the load supported under all conditions.

The cup 1 maybe securedto an axle of the yieldably .vehic'le'in any suitable manner and the head, 10 is so arranged that the load of the body will be, initially received thereon. Obviously, the load be first imparted to the spring 11 andythen successively to the springs 12, 13and 14 respectively; When' the device is' sub ected to the fullest extent of the load the respective flanges 7 of the cu'ps2, 3 and 4 will contact andat which time the associated sprmgs are fully compressed. At this time the flange 9 will engage the flange 7' of the cup 4. When the springs 11, 12 and 13 are fully compressed the spr' 14'will be partly compressed in order to yieldably support theentire load to absorb shocks which maiy occur. Obviously, the cups 3 and 4 will in y met within the cup 2 when subjected to capacity loads, thus compressin the associated springs, and owin to t e tapered.. formation of the cups, bin ing of the springs with the sides thereof is prevented.

In Figures 3 and 4 ofthe drawings, I have "illustrated a slightl m'odifiedform of-the I" invention deslgned or m} in comparatively narrow s aces. In lieu of the cup 1, I employ an e on ated base late ada ted to be secured to e axle an has carrie .thereby bosses 16-16 for centering the lower helixes 5 of the coil springs 17-17 the upper helixes thereof being engaged with the bosses 18-48" and seated within sockets 20-20 of a cap plate 19. Arranged between these sockets 1s a cup 21 which cooperates with the cups 22 10 and 23, and springs 24, 25 and 26 in the same manner as the. cu s of'the preferred form of the invention an since the operation is the same as that of the preferred form, a detailed description thereof is not thought necessary.

16 From the foregoing, it is thought that the construction, operation, and many adva n' tages of the herein described invention W111 be apparent to those skilled in the art, without further description, and it will be under- 20 stood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

as What is claimed is:

1. In shock absorbing springs for vehicles, relatively movable base and cap plates, the cap plate having spaced sockets and a cup between thesockets, helical springs in said EH3 sockets bearing upon said base plate, a. helical spring in said cup, a plurality of concentrically disposed cups having flanges upon their upper and lower ends, and a plurality of coil springs encircling the cups and havas ing their terminals bearing upon the flanges of the respective cups, the lowermost of said pluralit of cups being seated upon the spring carried y said ca plate cup.

2. Shock absor ing springs for vehicles as comprising a base plate having bosses thereon, a cap plate havingspaced sockets above the bosses, and having a centrally disposed cup between the sockets, helical springs carried in said sockets and bearing upon said as base plate, said springs being centered on said bosses, a helical spring disposed in said centrally disposed cup, a lurality of concentrically disposed cups aving flanges upon their upper and lower ends, and a plurality of coil springs encircling the cups and havin their terminals bearing upon the flan es 0% respective cups, the lowermost cup o said plurality of cups being seated upon the spring carried by said cap plate cup.

as In testimony whereof I aflix my signature.

ALEXANDER W. SANSBURN. 

